I also have the AES2810 reader in my X200s ThinkPad, also installed fprint from PPA, and get the same error as Jonas. Windows 10 is using the reader well, Ubuntu15.10 recognizes it, adds the aes2550 driver, but the enroll stops with unknown error.
I also have the AES2810 reader in my X200s ThinkPad, also installed fprint from PPA, and get the same error as Jonas. Windows 10 is using the reader well, Ubuntu15.10 recognizes it, adds the aes2550 driver, but the enroll stops with unknown error.